       
 \adjustbox{max width=\textwidth}{
        \begin{tabular}{l|ccccccc}
        \toprule
        \multicolumn{1}{c|}{Category} & 
        \multicolumn{2}{c}{\small Share Expenditure 2009} & 
        \multicolumn{3}{c}{\small E-Commerce Intensity} &  
          \multicolumn{1}{c}{\small Catalog Intensity}
         \\ \cmidrule(lr){2-3}\cmidrule(lr){4-6}
        & 
        \multicolumn{1}{c}{\small Total} & 
        \multicolumn{1}{c}{\small E-Commerce} &  
        \multicolumn{1}{c}{\small 2004} &
          \multicolumn{1}{c}{\small 2009} &
            \multicolumn{1}{c}{\small 2014} & 
            \multicolumn{1}{c}{\small 1999} 
            \\
       